JP3979965B2

JP3979965B2 - Color cathode ray tube

Info

Publication number: JP3979965B2
Application number: JP2003134771A
Authority: JP
Inventors: 巨大塚; 清仁三輪; ▲寛▼敏渡辺
Original assignee: Panasonic Corp; Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Corp; Panasonic Holdings Corp
Priority date: 2002-05-23
Filing date: 2003-05-13
Publication date: 2007-09-19
Anticipated expiration: 2023-05-13
Also published as: JP2004047444A

Description

【０００１】
【発明の属する技術分野】
本発明は、テレビジョン受像機又はコンピュータディスプレイに用いられるカラー陰極線管に関する。
【０００２】
【従来の技術】
近年、外光の映り込みが少なく見栄えがよいことから、画像が映し出されるフェイスパネルがほぼ平面であるカラー陰極線管が主流になりつつある。これに伴い、フェイスパネルの内面と対向して管内に配置されるシャドウマスクは従前よりも平面に近い状態で支持されるようになっている。その支持方式として、シャドウマスクを張力を印加した状態でフレームに溶接固定するテンション方式が知られている。
【０００３】
テンション方式のカラー陰極線管では、スピーカー等からの振動伝搬によりシャドウマスクが振動することによって生じる色ズレを防止するため、振動を抑制する様々な策が講じられている。例えば、特許文献１には、折り曲げによって枠状に形成された振動減衰体をシャドウマスクに遊動可能な状態で取り付ける技術が開示されている。
【０００４】
この技術によれば、シャドウマスクの振動時に振動減衰体がシャドウマスクに対して独立して運動することにより、シャドウマスクの振動エネルギーが、振動減衰体とシャドウマスクとの間の摩擦エネルギーに変換されて消費されるので、シャドウマスクの振動を減衰させることができる。更に、振動減衰体を簡単に精度良く形成することができる。
【０００５】
【特許文献１】
特開２００１−１０１９７８号公報
【０００６】
【発明が解決しようとする課題】
しかしながら、上記従来技術に示す枠状の振動減衰体は、遊動可能な状態を常に維持できるのであればシャドウマスクの振動抑制に非常に効果的であるが、図１１に示すように、振動減衰体３１の折り曲げ部３２ａ又は３２ｂがシャドウマスク５の取付孔３３の周縁に引っかかりやすく、このように振動減衰体３１が一度引っかかってシャドウマスク５に係止固定されてしまうと、再び遊動するのが不可能な状態となり、シャドウマスク５の振動を効果的に減衰させることが困難となってしまうという課題があった。
【０００７】
本発明はこのような課題を解決するためになされたものであり、遊動可能な状態を常に維持できるように取り付けられた振動減衰体を備えることにより、シャドウマスクの振動が効果的に減衰されるカラー陰極線管を提供することを目的とする。
【０００８】
【課題を解決するための手段】
上記の目的を達成するために、本発明のカラー陰極線管は以下のように構成される。
【０００９】
即ち、本発明のカラー陰極線管は、張力が印加された状態で保持されたシャドウマスクと、前記シャドウマスク又は前記シャドウマスクに取り付けられて前記シャドウマスクの振動により振動する別部材に設けられた２つの取り付け孔と、前記２つの取り付け孔を貫通し、遊動可能な状態で前記シャドウマスク又は前記別部材に取り付けられて、前記シャドウマスクの振動を減衰させる振動減衰体とを備える。
【００１０】
本発明の第１のカラー陰極線管では、前記振動減衰体は、前記２つの取り付け孔をそれぞれ遊貫する２つの貫通部と、前記２つの貫通部を繋ぐ亘り部とを有し、前記２つの貫通部は前記亘り部の両端にて前記亘り部に対して折り曲げられており、前記亘り部に、前記シャドウマスク又は前記別部材に向かって突出した突起又は突出部が設けられている。
【００１１】
本発明の第２のカラー陰極線管では、前記振動減衰体は、前記２つの取り付け孔をそれぞれ遊貫する２つの貫通部と、前記２つの貫通部を繋ぐ亘り部とを少なくとも有し、前記シャドウマスク又は前記別部材の、前記２つの取り付け孔の間の領域に、前記振動減衰体に向かって突出した突起又は突出部が設けられている。
【００１２】
本発明の第３のカラー陰極線管では、前記振動減衰体は、前記２つの取り付け孔をそれぞれ遊貫する２つの貫通部と、前記２つの貫通部を繋ぐ亘り部とを少なくとも有し、前記カラー陰極線管は、更に、前記振動減衰体によって貫通され、遊動可能な状態で前記振動減衰体に取り付けられた有孔部材を備える。
【００１３】
本発明の第４のカラー陰極線管では、前記２つの取り付け孔が前記シャドウマスクに設けられており、前記振動減衰体が前記シャドウマスクに取り付けられており、前記振動減衰体は、前記２つの取り付け孔をそれぞれ遊貫する２つの貫通部と、前記２つの貫通部を繋ぐ亘り部とを少なくとも有し、前記振動減衰体は、前記２つの貫通部の中央位置に対して非対称形状を有し、前記非対称形状が前記振動減衰体の前記シャドウマスクの面に対する傾斜角度を規制することにより、前記振動減衰体の前記シャドウマスクに対する遊動可能な状態が維持される。あるいは、本発明の第４のカラー陰極線管では、前記張力が垂直方向に印加されており、前記シャドウマスクの水平方向の端部又は前記シャドウマスクの水平方向の端部に取り付けられて前記シャドウマスクの振動により振動する別部材に、前記２つの取り付け孔が設けられており、前記振動減衰体は、前記２つの取り付け孔をそれぞれ遊貫する２つの貫通部と、前記２つの貫通部を繋ぐ亘り部とを少なくとも有し、前記振動減衰体は、前記２つの貫通部の中央位置に対して非対称形状を有し、前記非対称形状が前記振動減衰体の前記シャドウマスク又は前記別部材の面に対する傾斜角度を規制することにより、前記振動減衰体の前記シャドウマスク又は前記別部材に対する遊動可能な状態が維持される。あるいは、本発明の第４のカラー陰極線管では、前記振動減衰体は、前記２つの取り付け孔をそれぞれ遊貫する２つの貫通部と、前記２つの貫通部を繋ぐ亘り部とを少なくとも有し、前記振動減衰体は、前記２つの貫通部の中央位置に対して非対称形状を有するように前記亘り部の一端は前記貫通部を越えて延出している。
【００１４】
【発明の実施の形態】
本発明の上記の第１〜第４のカラー陰極線管によれば、振動減衰体の遊動可能な状態が常に維持されるので、シャドウマスクの振動が効果的に減衰され、色ズレの少ないカラー陰極線管を提供することができる。
【００１５】
以下に本発明の実施の形態を図面を用いて詳細に説明する。
【００１６】
カラー陰極線管の一例を図２に示す。カラー陰極線管１は、内面に蛍光体スクリーン２ａが形成されたパネル２とファンネル３とからなる外囲器を備える。ファンネル３のネック部３ａには電子銃４が内装されている。蛍光体スクリーン２ａに対向するシャドウマスク５がマスクフレーム６によって支持され、マスクフレーム６はスプリング（図示せず）を介してパネル２の内壁に設けられたパネルピン（図示せず）に取り付けられる。また、電子銃４から射出される電子ビーム７を偏向走査させるために、ファンネル３の外部に偏向ヨーク８が設けられている。
【００１７】
カラー陰極線管のシャドウマスク５とマスクフレーム６との組み立て体の一実施形態を図３に示す。マスクフレーム６は長方形状の枠体であり、一対の長辺フレーム６ａと一対の短辺フレーム６ｂとから構成されている。多数の開孔を有するシャドウマスク５は、矢印９の方向、つまり垂直方向（Ｘ軸方向）に張力を印加された状態で長辺フレーム６ａに溶接されている。また、シャドウマスクの張力印加方向と直交する方向、つまり水平方向（Ｙ軸方向）の端部には、振動減衰体１０が取り付けられている。
【００１８】
（実施の形態１）
図１は、シャドウマスク５に本発明の実施の形態１の振動減衰体１０が取り付けられた様子を詳細に示した部分断面図である。振動減衰体１０は、亘り部１３ａと、その両端の折り曲げ部１２ａにて亘り部１３ａに対して折り曲げられた２つの貫通部１３ｂとを有する。２つの貫通部１３ｂを、シャドウマスク５に設けられた２つの取り付け孔１１に貫通させた後、２つの貫通部１３ｂは折り曲げ部１２ｂで亘り部１３ａ側に折り曲げられ、更に折り返し部１２ｃで亘り部１３ａとは反対側に折り曲げられる。貫通部１３ｂの外径は取り付け孔１１の孔径より小さく、且つ２つの貫通部１３ｂの間隔が２つの取り付け孔１１の間隔と略等しいので、振動減衰体１０はシャドウマスク５に対して自由に遊動可能な状態でシャドウマスク５に取り付けられる。本発明において、振動減衰体１０がシャドウマスク５に対して「自由に遊動可能」とは、シャドウマスク５が振動すれば、振動減衰体１０は、シャドウマスク５の振動とは独立して、シャドウマスク５に対して浮き上がり、衝突し、跳ね返る等の運動を繰り返してできる状態を意味する。従って、シャドウマスク５が振動したとき振動減衰体１０がシャドウマスク５とは独立して運動することができない「固着」や「固定」とは明らかに異なる。
【００１９】
亘り部１３ａには、シャドウマスク５に向かって突出した二つの突起１４が設けられている。この突起１４が設けられていることにより、振動減衰体１０の亘り部１３ａがシャドウマスク５からオフセット（離間）される。これにより振動減衰体１０のシャドウマスク５の面に対する傾斜角度が規制されるため、折り曲げ部１２ａ、１２ｂが取り付け孔１１の周縁に引っかかって、振動減衰体１０がシャドウマスク５に係止固定されてしまう現象を防止することができる。
【００２０】
ここで、本発明の具体的実施例とその効果について説明する。本発明の実施例として、図１において、亘り部１３ａの長さＬ1＝７０ｍｍ、折り曲げ部１２ａ，１２ｂ間長さＬ2＝２．５ｍｍ、折り返し高さＬ3＝１．０ｍｍ、突起１４の高さＬ4＝０．５ｍｍ、折り曲げ部１２ａから突起１４の中心までの距離Ｌ5＝７．５ｍｍ、線径０．９ｍｍのＳＵＳ４３０材からなる振動減衰体１０を、シャドウマスク５の水平方向端部に片側二つずつ、孔径１．４ｍｍの取り付け孔１１に貫通させて取り付けた画面対角サイズ７６ｃｍのテンション方式のワイドカラー陰極線管を準備した。また、比較例として、突起１４を有さず、亘り部１３ａがほぼ直線状である点を除いて上記実施例の振動減衰体と同じ振動減衰体（外形および取り付け位置は上記実施例と同様とする。）をシャドウマスクに取り付けた同サイズのカラー陰極線管を準備した。
【００２１】
これら二つのカラー陰極線管について、振動による色ズレの目立ちやすい箇所である画面の中央と水平方向端との中間よりもやや端部寄りの位置（シャドウマスクの中心の座標を（Ｘ，Ｙ）＝（０，０）とするとき、座標点（２８０，０）（単位：ｍｍ）の位置）において、シャドウマスクの振動が最も著しくなる周波数帯域（約１６０Ｈｚ）の音をスピーカーから与えたときのシャドウマスクの振動の振幅と減衰時間を測定した。この結果を表１に示す。
【００２２】
【表１】

【００２３】
表１から、本発明の実施例は、比較例に比べて最大振幅が小さく、また振幅の減衰時間も短いことがわかる。
【００２４】
なお、図１を用いて説明した本実施の形態では、振動減衰体１０の亘り部１３ａに設けた突起１４の形をほぼ円弧状としているが、これに限らず、例えば三角形状や台形状としてもよい。また、突起の数は二つに限定されるものではない。さらに、図４に示すように、振動減衰体１０の亘り部１３ａに、ある程度の長さを有する突出部１５を設けてもよい。また、突起又は突出部は、振動減衰体１０の材料を変形させて形成するのではなく、別部材を振動減衰体１０の亘り部１３ａに取り付けることにより形成しても良い。
【００２５】
本実施の形態では、折り曲げ部１２ｂの折り曲げ角度は、振動減衰体１０がシャドウマスク５から落下しない程度の角度であればよい。但し、図１に示すように、折り曲げ部１２ｂに対して自由端側の部分１３ｃが貫通部１３ｂに対して鋭角をなすように、折り曲げ部１２ｂで折り曲げることが好ましい。これにより、部分１３ｃによっても振動減衰体１０のシャドウマスク５の面に対する傾斜角度が規制されるため、折り曲げ部１２ａ、１２ｂが取り付け孔１１の周縁に引っかかって、振動減衰体１０がシャドウマスク５に係止固定されてしまう現象を一層防止することができる。
【００２６】
（実施の形態２）
図５は、本発明の実施の形態２を示した部分断面図である。本実施の形態が実施の形態１と異なる点は、振動減衰体１０の係止固定を防止する手段をシャドウマスク５に設けた点である。振動減衰体１０は２つの取り付け孔１１を貫通し且つ折り曲げられてシャドウマスク５に取り付けられている。シャドウマスク５の２つの取り付け孔１１の間の領域に、振動減衰体１０の亘り部１３ａに向かって突出した突起１６が設けられている。この突起１６により振動減衰体１０の亘り部１３ａがシャドウマスク５からオフセットされる。これにより、振動減衰体１０のシャドウマスク５の面に対する傾斜角度が規制されるため、折り曲げ部１２ａ、１２ｂが取り付け孔１１の周縁に引っかかって、振動減衰体１０がシャドウマスク５に係止固定されてしまう現象を防止することができる。
【００２７】
なお、突起１６の形状や個数は特に限定はない。また、突起１６の亘り部１３ａに沿った方向の長さを大きくした突出部としても良い。突起１６や突出部の形成方法は特に限定はなく、シャドウマスク５に別部材を接着、溶接などにより取り付けて形成しても良く、あるいはシャドウマスク５をプレス加工などにより変形させて形成しても良い。
【００２８】
（実施の形態３）
図６は、本発明の実施の形態３を示した部分断面図である。本実施の形態が実施の形態１，２と異なる点は、振動減衰体１０の係止固定を防止する手段を振動減衰体１０及びシャドウマスク５とは別部材として設けた点である。図６に示すように、２つの貫通部１３ｂを、２つのワッシャ（有孔部材）１７の中央の開孔１８にそれぞれ貫通させた後、シャドウマスク５に設けられた２つの取り付け孔１１に貫通させることにより、振動減衰体１０は実施の形態１と同様にしてシャドウマスク５に取り付けられている。ワッシャ１７の開孔１８は取り付け孔１１よりも孔径が小さいことが好ましい。また、ワッシャ１７は、振動減衰体１０の亘り部１３ａではなく、貫通部１３ｂにて保持されるように、その外径、孔径などが設定される。このように、亘り部１３ａとシャドウマスク５との間に、取り付け孔１１の周縁と重なるように、ワッシャ１７を振動減衰体１０に取り付けることにより、振動減衰体１０の遊動可能な状態が維持されながら、振動減衰体１０の亘り部１３ａがシャドウマスク５からオフセットされる。これにより振動減衰体１０のシャドウマスク５の面に対する傾斜角度が規制されるため、折り曲げ部１２ａ、１２ｂが取り付け孔１１の周縁に引っかかって、振動減衰体１０がシャドウマスク５に係止固定されてしまう現象を防止することができる。
【００２９】
ワッシャ１７の開孔１８の孔径は振動減衰体１０の貫通部１３ｂの外径よりも大きいことが好ましい。これにより、ワッシャ１７は振動減衰体１０に対して遊動可能な状態で振動減衰体１０に取り付けられる。その結果、振動減衰体１０に加えてワッシャ１７も振動減衰機能を発揮するので、シャドウマスク５の振動減衰効果が一層向上する。また、たとえ折り曲げ部１２ａ、１２ｂが取り付け孔１１の周縁に係止されたとしても、ワッシャ１７が振動することにより折り曲げ部１２ａ、１２ｂと取り付け孔１１の周縁との係止が解除される。
【００３０】
亘り部１３ａをシャドウマスク５からオフセットさせることができれば、別部材として設ける係止固定防止手段は図６のワッシャ１７に限定されない。例えば、図７に示すように、１枚の平板１９を、これに設けられた２つの開孔１９ａに一対の貫通部１３ｂをそれぞれ貫通させて、且つ亘り部１３ａとシャドウマスク５との間に位置させて、振動減衰体１０に取り付けても良い。この場合も、平板１９の一対の開孔１９ａの孔径及び間隔を適切に設定して、平板１９が振動減衰体１０に対して遊動可能な状態で振動減衰体１０に取り付けられる。
【００３１】
更に、図８に示すように、中空円筒形状のパイプ２０を、その中空部に亘り部１３ａを貫通させて、亘り部１３ａに取り付けても良い。この場合も、パイプ２０の中空部の孔径を適切に設定して、パイプ２０が振動減衰体１０に対して遊動可能な状態で振動減衰体１０に取り付けられる。なお、亘り部１３ａに取り付けられるパイプの数は１つである必要はなく、複数であっても良い。
【００３２】
（実施の形態４）
図９は、本発明の実施の形態４を示した部分断面図である。本実施の形態が実施の形態１〜３と異なる点は、振動減衰体１０を、一対の貫通部１３ｂの中央位置に対して非対称な形状とした点である。即ち、振動減衰体１０の上端側において、亘り部１３ａの一端２１は貫通部１３ｂを越えて上側へ延出しており、また、下端側において、折り曲げ部１２ｂでの自由端側部分２２の折り曲げ方向を下側としている。このようにすることによっても、振動減衰体１０のシャドウマスク５の面に対する傾斜角度が規制されるため、折り曲げ部１２ａ、１２ｂが取り付け孔１１の周縁に引っかかって、振動減衰体１０がシャドウマスク５に係止固定されてしまう現象を防止することができる。また、振動減衰体１０の重心位置が一対の貫通部１３ｂの中央位置より外れるので、シャドウマスク５の振動時における振動減衰体１０の運動が活発になるので、振動減衰体１０がシャドウマスク５に係止固定されにくくなる。
【００３３】
なお、本実施の形態では、振動減衰体１０が、一対の貫通部１３ｂの中央位置に対して非対称形状を有していればよく、図９のような形状に限定されない。
【００３４】
（実施の形態５）
図１０Ａは、本発明の振動減衰体１０が取り付けられたシャドウマスク組み立て体の別の例を示した概略斜視図、図１０Ｂは図１０Ａにおいて矢印１０Ｂの方向から見たシャドウマスク組み立て体の部分側面図である。本実施の形態５が図３に示したシャドウマスク組み立て体と異なる点は、本実施の形態５では、振動減衰体１０が、シャドウマスク５ではなく部材５１に取り付けられている点である。以下、この相違点について説明する。
【００３５】
図１０Ａ及び図１０Ｂに示すように、部材５１は、シャドウマスク５の、電子ビーム通過孔が形成された領域よりも水平方向の両外側の領域に取り付けられている。図１０Ｂに示すように、部材５１は、帯状の金属板からなり、中央部分がシャドウマスク５から離間するように、その両端が折り曲げられて、両端においてのみシャドウマスク５と溶接される。振動減衰体１０は、部材５１の、シャドウマスク５から離間した中央部分に形成された２つの取り付け孔（図示せず）を貫通して、遊動可能な状態で部材５１に取り付けられている。振動減衰体１０はシャドウマスク５とは接触しない。シャドウマスク５が振動すると、その振動により部材５１も振動する。このとき、振動減衰体１０が部材５１の振動を減衰させる結果、シャドウマスク５の振動も減衰される。振動減衰体１０は実施の形態１で説明したのと同様の構成を有する。従って、実施の形態１と同様に、振動減衰体１０が部材５１に係止固定されてしまう現象を防止することができる。
【００３６】
なお、図１０Ａ、図１０Ｂでは、振動減衰体１０を取り付けるための部材５１に実施の形態１を適用した例を示したが、実施の形態２〜４を適用しても良く、いずれの場合も上記と同様の効果が得られる。なお、実施の形態２を適用する場合には、突起１６（又は突出部）はシャドウマスク５ではなく、部材５１に設けられる。
【００３７】
また、振動減衰体１０が取り付けられる、シャドウマスク５とは別の部材は、シャドウマスク５に取り付けられて、シャドウマスク５の振動により振動する部材であれば、図１０Ａ及び図１０Ｂに示す部材５１に限定されない。
【００３８】
以上に説明した実施の形態１〜５では、振動減衰体１０がシャドウマスク５の水平方向の両端部にそれぞれ二つずつ取り付けられた例を示したが、カラー陰極線管のサイズやシャドウマスク５の張力分布によって振動減衰体１０の個数や大きさを適宜変更してもよい。
【００３９】
また、取り付け孔１１の開孔形状は、上記の実施の形態１〜５では円形としているが、これに限らない。例えば、一つの振動減衰体１０に対して設けられる２つの取り付け孔のうち少なくとも１つを長孔形状としてもよく、このようにすることで振動減衰体１０を取り付けやすくなる。
【００４０】
【発明の効果】
以上のように、本発明によれば、振動減衰体の遊動可能な状態が常に維持されるので、シャドウマスクの振動が効果的に減衰され、色ズレの少ないカラー陰極線管を提供することができる。
【図面の簡単な説明】
【図１】本発明の実施の形態１に係るカラー陰極線管における振動減衰体とシャドウマスクを示す断面図
【図２】本発明の一実施形態に係るカラー陰極線管の概略断面図
【図３】本発明の一実施形態に係るカラー陰極線管のシャドウマスク組み立て体を示す斜視図
【図４】本発明の実施の形態１に係るカラー陰極線管における振動減衰体とシャドウマスクの別の構成例を示す断面図
【図５】本発明の実施の形態２に係るカラー陰極線管における振動減衰体とシャドウマスクを示す断面図
【図６】本発明の実施の形態３に係るカラー陰極線管における振動減衰体とシャドウマスクを示す断面図
【図７】本発明の実施の形態３に係るカラー陰極線管における振動減衰体とシャドウマスクの別の構成例を示す断面図
【図８】本発明の実施の形態３に係るカラー陰極線管における振動減衰体とシャドウマスクの更に別の構成例を示す断面図
【図９】本発明の実施の形態４に係るカラー陰極線管における振動減衰体とシャドウマスクを示す断面図
【図１０】図１０Ａは、本発明の実施の形態５に係るカラー陰極線管におけるシャドウマスク組み立て体の概略斜視図図１０Ｂは、図１０Ａにおいて矢印１０Ｂの方向から見たシャドウマスク組み立て体の部分側面図
【図１１】従来のカラー陰極線管における振動減衰体とシャドウマスクを示す断面図
【符号の説明】
１カラー陰極線管
５シャドウマスク
６マスクフレーム
１０振動減衰体
１１取り付け孔
１３ａ亘り部
１３ｂ貫通部
１４，１６突起
１５突出部
１７ワッシャ（有孔部材）
１９平板（有孔部材）
２０パイプ（有孔部材）
５１部材（別部材）[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a color cathode ray tube used for a television receiver or a computer display.
[0002]
[Prior art]
In recent years, a color cathode ray tube in which a face panel on which an image is projected is almost flat is becoming mainstream because external light is less reflected and the appearance is good. Along with this, the shadow mask disposed in the pipe facing the inner surface of the face panel is supported in a state closer to a plane than before. As a supporting method, a tension method is known in which a shadow mask is welded and fixed to a frame in a state where a tension is applied.
[0003]
In the tension type color cathode ray tube, various measures for suppressing the vibration are taken in order to prevent the color shift caused by the vibration of the shadow mask due to the vibration propagation from a speaker or the like. For example, Patent Document 1 discloses a technique in which a vibration damping body formed into a frame shape by bending is attached to a shadow mask in a freely movable state.
[0004]
According to this technology, when the shadow mask vibrates, the vibration damping body moves independently of the shadow mask, so that the vibration energy of the shadow mask is converted into friction energy between the vibration damping body and the shadow mask. Therefore, the vibration of the shadow mask can be attenuated. Further, the vibration damping body can be easily formed with high accuracy.
[0005]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-101978
[Problems to be solved by the invention]
However, the frame-like vibration attenuator shown in the above prior art is very effective for suppressing the vibration of the shadow mask as long as it can maintain a freely movable state. However, as shown in FIG. The

bent portion

32a or 32b of 31 is easily caught on the periphery of the mounting hole 33 of the shadow mask 5, and if the vibration damping body 31 is once caught and locked to the shadow mask 5 in this way, it will not be allowed to float again. There is a problem that it becomes possible and it becomes difficult to effectively attenuate the vibration of the shadow mask 5.
[0007]
The present invention has been made to solve such a problem, and the vibration of the shadow mask is effectively damped by providing a vibration attenuator attached so as to always maintain a movable state. An object is to provide a color cathode ray tube.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the color cathode ray tube of the present invention is configured as follows.
[0009]
That is, the color cathode ray tube of the present invention is provided with a shadow mask held in a state where a tension is applied, and another member attached to the shadow mask or the shadow mask and vibrated by the vibration of the shadow mask. And a vibration attenuator that passes through the two attachment holes and is attached to the shadow mask or the separate member in a movable state to attenuate the vibration of the shadow mask.
[0010]
In the first color cathode ray tube of the present invention, the vibration attenuating body has two through portions that loosely pass through the two attachment holes, and a connecting portion that connects the two through portions, and the two The penetrating portion is bent with respect to the spanning portion at both ends of the spanning portion, and the spanning portion is provided with a projection or a projection protruding toward the shadow mask or the separate member.
[0011]
In the second color cathode ray tube of the present invention, the vibration attenuator has at least two penetrating parts that loosely pass through the two attachment holes, and a connecting part that connects the two penetrating parts, and the shadow A protrusion or a protruding portion protruding toward the vibration damping body is provided in a region between the two attachment holes of the mask or the separate member.
[0012]
In the third color cathode-ray tube of the present invention, the vibration damping body has two through-section for loosely fitted the two mounting holes, respectively, and over portion connecting the two through portions at least, the The color cathode ray tube further includes a perforated member that is penetrated by the vibration attenuating body and attached to the vibration attenuating body in a freely movable state.
[0013]
In the fourth color cathode ray tube of the present invention, the two attachment holes are provided in the shadow mask, the vibration attenuator is attached to the shadow mask, and the vibration attenuator is attached to the two attachments. has two through portions which loosely fits the hole, respectively, and over portion connecting the two through portions at least, the vibration damping body, the asymmetric possess the central position of the two through portions, The asymmetrical shape regulates the inclination angle of the vibration attenuator with respect to the surface of the shadow mask, so that the state in which the vibration attenuator can move with respect to the shadow mask is maintained . Alternatively, in the fourth color cathode ray tube of the present invention, the tension is applied in the vertical direction, and the shadow mask is attached to the horizontal end of the shadow mask or the horizontal end of the shadow mask. The two attachment holes are provided in another member that vibrates due to the vibration of the vibration, and the vibration attenuating body spans the two penetration parts that pass through the two attachment holes and the two penetration parts. at least and a part, the vibration damping body, the asymmetric shape possess the central position of the two through portions, inclined with respect to the shadow mask or face of the further member of the asymmetric shape the vibration attenuator By restricting the angle, the movable state of the vibration damping body with respect to the shadow mask or the separate member is maintained . Alternatively, in the fourth color cathode ray tube of the present invention, the vibration attenuator has at least two penetrating portions each loosely penetrating the two attachment holes, and a bridging portion connecting the two penetrating portions, The vibration attenuator has an asymmetric shape with respect to the center position of the two penetrating parts, and one end of the spanning part extends beyond the penetrating part.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
According to the first to fourth color cathode ray tubes of the present invention, since the movable state of the vibration attenuating body is always maintained, the vibration of the shadow mask is effectively attenuated, and the color cathode ray with less color misregistration. A tube can be provided.
[0015]
Embodiments of the present invention will be described below in detail with reference to the drawings.
[0016]
An example of a color cathode ray tube is shown in FIG. The color cathode ray tube 1 includes an envelope composed of a panel 2 having a phosphor screen 2 a formed on the inner surface and a funnel 3. An electron gun 4 is housed in the neck portion 3 a of the funnel 3. A shadow mask 5 facing the phosphor screen 2a is supported by a mask frame 6, and the mask frame 6 is attached to a panel pin (not shown) provided on the inner wall of the panel 2 via a spring (not shown). A deflection yoke 8 is provided outside the funnel 3 to deflect and scan the electron beam 7 emitted from the electron gun 4.
[0017]
One embodiment of an assembly of a shadow mask 5 and a mask frame 6 of a color cathode ray tube is shown in FIG. The mask frame 6 is a rectangular frame, and includes a pair of long side frames 6a and a pair of short side frames 6b. The shadow mask 5 having a large number of apertures is welded to the long side frame 6a in a state where tension is applied in the direction of the arrow 9, that is, in the vertical direction (X-axis direction). A vibration attenuator 10 is attached to the end of the shadow mask in the direction orthogonal to the tension application direction, that is, in the horizontal direction (Y-axis direction).
[0018]
(Embodiment 1)
FIG. 1 is a partial cross-sectional view showing in detail a state in which the vibration damping body 10 according to the first embodiment of the present invention is attached to the shadow mask 5. The vibration attenuating body 10 has a span portion 13a and two through portions 13b that are bent with respect to the span portion 13a at the bent portions 12a at both ends thereof. After penetrating the two through-holes 13b through the two attachment holes 11 provided in the shadow mask 5, the two through-holes 13b are bent at the bent portion 12b to the crossing portion 13a side, and further at the turn-up portion 12c. It is bent to the opposite side to 13a. Since the outer diameter of the through-hole 13b is smaller than the hole diameter of the mounting hole 11 and the interval between the two through-holes 13b is substantially equal to the interval between the two mounting holes 11, the vibration damping body 10 is free to move with respect to the shadow mask 5. It is attached to the shadow mask 5 in a possible state. In the present invention, the phrase “the vibration attenuator 10 can freely move” with respect to the shadow mask 5 means that if the shadow mask 5 vibrates, the vibration attenuator 10 It means a state in which repeated movements such as lifting, colliding, and rebounding with respect to the mask 5 are possible. Therefore, when the shadow mask 5 vibrates, the vibration attenuating body 10 is clearly different from “fixed” and “fixed”, which cannot move independently of the shadow mask 5.
[0019]
Two protrusions 14 projecting toward the shadow mask 5 are provided on the crossing portion 13a. By providing the projection 14, the span 13 a of the vibration damping body 10 is offset (separated) from the shadow mask 5. As a result, the inclination angle of the vibration attenuator 10 with respect to the surface of the shadow mask 5 is restricted, so that the

bent portions

12a and 12b are caught by the peripheral edge of the mounting hole 11, and the vibration attenuator 10 is locked and fixed to the shadow mask 5. Can be prevented.
[0020]
Here, specific embodiments of the present invention and effects thereof will be described. As an embodiment of the present invention, in FIG. 1, the length L1 of the span portion 13a = 70 mm, the length L2 between the

bent portions

12a and 12b = 2.5 mm, the folding height L3 = 1.0 mm, and the height L4 of the projection 14 = 0.5 mm, a distance L5 from the bent portion 12 a to the center of the protrusion 14 L = 7.5 mm, and two vibration attenuators 10 made of SUS430 material having a wire diameter of 0.9 mm at the horizontal end of the shadow mask 5. A tension-type wide color cathode ray tube having a screen diagonal size of 76 cm was prepared by passing through the mounting hole 11 having a hole diameter of 1.4 mm. Further, as a comparative example, the same vibration attenuating body as the above-described embodiment (external shape and mounting position are the same as those of the above-described embodiment) except that the protrusion 14 is not provided and the span portion 13a is substantially linear. A color cathode ray tube of the same size attached to a shadow mask was prepared.
[0021]
For these two color cathode ray tubes, a position slightly closer to the edge than the middle between the center of the screen and the horizontal edge where the color shift due to vibration is conspicuous (the coordinates of the center of the shadow mask are (X, Y) = When (0, 0) is set, the shadow when the sound of the frequency band (about 160 Hz) where the vibration of the shadow mask is most remarkable is given from the speaker at the coordinate point (280, 0) (unit: mm). The vibration amplitude and decay time of the mask were measured. The results are shown in Table 1.
[0022]
[Table 1]

[0023]
From Table 1, it can be seen that the example of the present invention has a smaller maximum amplitude and shorter amplitude decay time than the comparative example.
[0024]
In the present embodiment described with reference to FIG. 1, the shape of the protrusion 14 provided on the span 13 a of the vibration damping body 10 is substantially arcuate, but the shape is not limited to this, for example, a triangular shape or a trapezoidal shape. Also good. Moreover, the number of protrusions is not limited to two. Furthermore, as shown in FIG. 4, a protruding portion 15 having a certain length may be provided in the span portion 13 a of the vibration damping body 10. Further, the protrusions or the protruding portions may be formed by attaching another member to the spanning portion 13 a of the vibration attenuating body 10 instead of deforming the material of the vibration attenuating body 10.
[0025]
In the present embodiment, the bending angle of the bent portion 12 b may be an angle that does not cause the vibration damping body 10 to fall from the shadow mask 5. However, as shown in FIG. 1, it is preferable that the bent portion 12b bends so that the free end side portion 13c forms an acute angle with respect to the penetrating portion 13b. Accordingly, the inclination angle of the vibration attenuating body 10 with respect to the surface of the shadow mask 5 is also restricted by the portion 13 c, so that the

bent portions

12 a and 12 b are caught on the periphery of the mounting hole 11, and the vibration attenuating body 10 is attached to the shadow mask 5. The phenomenon of being locked and fixed can be further prevented.
[0026]
(Embodiment 2)
FIG. 5 is a partial sectional view showing Embodiment 2 of the present invention. The difference between the present embodiment and the first embodiment is that the shadow mask 5 is provided with means for preventing the vibration damping body 10 from being locked and fixed. The vibration attenuator 10 is attached to the shadow mask 5 through the two attachment holes 11 and bent. In the region between the two attachment holes 11 of the shadow mask 5, a projection 16 is provided that protrudes toward the span 13 a of the vibration damping body 10. The projection 16 offsets the span 13 a of the vibration attenuating body 10 from the shadow mask 5. As a result, the inclination angle of the vibration attenuating body 10 with respect to the surface of the shadow mask 5 is regulated, so that the

bent portions

12a and 12b are hooked on the periphery of the mounting hole 11 and the vibration attenuating body 10 is locked and fixed to the shadow mask 5. Can be prevented.
[0027]
The shape and number of the protrusions 16 are not particularly limited. Moreover, it is good also as a protrusion part which lengthened the length of the direction along the span 13a of the protrusion 16. FIG. The method for forming the protrusions 16 and the protrusions is not particularly limited, and may be formed by attaching another member to the shadow mask 5 by adhesion, welding, or the like, or may be formed by deforming the shadow mask 5 by press working or the like. good.
[0028]
(Embodiment 3)
FIG. 6 is a partial sectional view showing Embodiment 3 of the present invention. This embodiment is different from the first and second embodiments in that means for preventing the vibration attenuator 10 from being locked and fixed is provided as a separate member from the vibration attenuator 10 and the shadow mask 5. As shown in FIG. 6, the two penetration portions 13 b are respectively penetrated through the central opening 18 of the two washers (perforated members) 17 and then penetrated into the two attachment holes 11 provided in the shadow mask 5. By doing so, the vibration attenuator 10 is attached to the shadow mask 5 in the same manner as in the first embodiment. The opening 18 of the washer 17 preferably has a smaller hole diameter than the mounting hole 11. Further, the outer diameter, the hole diameter, and the like of the washer 17 are set so that the washer 17 is held by the through portion 13b, not the span portion 13a of the vibration damping body 10. In this way, by attaching the washer 17 to the vibration attenuating body 10 so as to overlap the peripheral edge of the attachment hole 11 between the span portion 13a and the shadow mask 5, the state in which the vibration attenuating body 10 can move is maintained. However, the span 13 a of the vibration attenuator 10 is offset from the shadow mask 5. As a result, the inclination angle of the vibration attenuator 10 with respect to the surface of the shadow mask 5 is restricted, so that the

bent portions

12a and 12b are caught by the peripheral edge of the mounting hole 11, and the vibration attenuator 10 is locked and fixed to the shadow mask 5. Can be prevented.
[0029]
The hole diameter of the opening 18 of the washer 17 is preferably larger than the outer diameter of the through-hole 13b of the vibration damping body 10. As a result, the washer 17 is attached to the vibration attenuating body 10 in a state where it can move freely with respect to the vibration attenuating body 10. As a result, the washer 17 in addition to the vibration attenuator 10 also exhibits a vibration attenuating function, so that the vibration attenuating effect of the shadow mask 5 is further improved. Even if the

bent portions

12 a and 12 b are locked to the periphery of the attachment hole 11, the lock between the

bent portions

12 a and 12 b and the periphery of the attachment hole 11 is released by the vibration of the washer 17.
[0030]
As long as the span 13a can be offset from the shadow mask 5, the locking / fixing prevention means provided as a separate member is not limited to the washer 17 shown in FIG. For example, as shown in FIG. 7, a single flat plate 19 is passed through a pair of through-holes 13 b through two openings 19 a provided in the flat plate 19, and between the cross-section 13 a and the shadow mask 5. It may be positioned and attached to the vibration damping body 10. Also in this case, the diameter and interval of the pair of apertures 19 a of the flat plate 19 are set appropriately, and the flat plate 19 is attached to the vibration damping body 10 in a state in which the flat plate 19 can move with respect to the vibration damping body 10.
[0031]
Furthermore, as shown in FIG. 8, the hollow cylindrical pipe 20 may be attached to the span portion 13a by passing through the span portion 13a. Also in this case, the hole diameter of the hollow portion of the pipe 20 is appropriately set, and the pipe 20 is attached to the vibration damping body 10 in a state where the pipe 20 can move with respect to the vibration damping body 10. In addition, the number of pipes attached to the crossing part 13a does not need to be one, and may be plural.
[0032]
(Embodiment 4)
FIG. 9 is a partial sectional view showing Embodiment 4 of the present invention. The present embodiment is different from the first to third embodiments in that the vibration attenuating body 10 has an asymmetric shape with respect to the center position of the pair of through portions 13b. That is, on the upper end side of the vibration attenuating body 10, one end 21 of the span portion 13a extends upward beyond the penetrating portion 13b, and on the lower end side, the bending direction of the free end portion 22 at the bent portion 12b. Is on the lower side. This also restricts the inclination angle of the vibration attenuator 10 with respect to the surface of the shadow mask 5, so that the

bent portions

12 a and 12 b are caught on the peripheral edge of the attachment hole 11, and the vibration attenuator 10 is moved to the shadow mask 5. It is possible to prevent the phenomenon of being locked and fixed to. Further, since the position of the center of gravity of the vibration attenuating body 10 deviates from the center position of the pair of through portions 13b, the movement of the vibration attenuating body 10 during the vibration of the shadow mask 5 becomes active. It becomes difficult to be locked and fixed.
[0033]
In the present embodiment, it is sufficient that the vibration attenuator 10 has an asymmetric shape with respect to the center position of the pair of through portions 13b, and the shape is not limited to the shape shown in FIG.
[0034]
(Embodiment 5)
10A is a schematic perspective view showing another example of a shadow mask assembly to which the vibration damping body 10 of the present invention is attached, and FIG. 10B is a partial side view of the shadow mask assembly viewed from the direction of the arrow 10B in FIG. 10A. FIG. The fifth embodiment is different from the shadow mask assembly shown in FIG. 3 in that the vibration attenuator 10 is attached to the member 51 instead of the shadow mask 5 in the fifth embodiment. Hereinafter, this difference will be described.
[0035]
As shown in FIGS. 10A and 10B, the member 51 is attached to the regions on both outer sides of the shadow mask 5 in the horizontal direction from the region where the electron beam passage holes are formed. As shown in FIG. 10B, the member 51 is made of a band-shaped metal plate, and both ends thereof are bent so that the central portion is separated from the shadow mask 5 and is welded to the shadow mask 5 only at both ends. The vibration attenuator 10 is attached to the member 51 in a freely movable state through two attachment holes (not shown) formed in the central portion of the member 51 that is separated from the shadow mask 5. The vibration attenuator 10 is not in contact with the shadow mask 5. When the shadow mask 5 vibrates, the member 51 also vibrates due to the vibration. At this time, the vibration attenuator 10 attenuates the vibration of the member 51, so that the vibration of the shadow mask 5 is also attenuated. The vibration damping body 10 has the same configuration as that described in the first embodiment. Therefore, as in the first embodiment, the phenomenon that the vibration attenuator 10 is locked and fixed to the member 51 can be prevented.
[0036]
10A and 10B show an example in which the first embodiment is applied to the member 51 for attaching the vibration damping body 10, but the second to fourth embodiments may be applied, and in any case. The same effect as above can be obtained. When the second embodiment is applied, the protrusion 16 (or the protruding portion) is provided on the member 51 instead of the shadow mask 5.
[0037]
Further, a member different from the shadow mask 5 to which the vibration damping body 10 is attached is a member 51 shown in FIGS. 10A and 10B as long as it is a member attached to the shadow mask 5 and vibrated by the vibration of the shadow mask 5. It is not limited to.
[0038]
In the first to fifth embodiments described above, the example in which the vibration attenuator 10 is attached to each of both ends in the horizontal direction of the shadow mask 5 is shown. However, the size of the color cathode ray tube or the shadow mask 5 The number and size of the vibration attenuating bodies 10 may be appropriately changed depending on the tension distribution.
[0039]
Moreover, although the opening shape of the attachment hole 11 is circular in said Embodiment 1-5, it is not restricted to this. For example, at least one of the two attachment holes provided for one vibration attenuator 10 may have a long hole shape, and this makes it easy to attach the vibration attenuator 10.
[0040]
【The invention's effect】
As described above, according to the present invention, since the movable state of the vibration attenuator is always maintained, the shadow mask vibration is effectively attenuated, and a color cathode ray tube with little color misregistration can be provided. .
[Brief description of the drawings]
1 is a cross-sectional view showing a vibration attenuator and a shadow mask in a color cathode ray tube according to Embodiment 1 of the present invention. FIG. 2 is a schematic cross-sectional view of a color cathode ray tube according to an embodiment of the present invention. FIG. 4 is a perspective view showing a shadow mask assembly of a color cathode ray tube according to an embodiment of the present invention. FIG. 4 shows another configuration example of a vibration attenuator and a shadow mask in the color cathode ray tube according to embodiment 1 of the present invention. FIG. 5 is a sectional view showing a vibration attenuator and a shadow mask in a color cathode ray tube according to Embodiment 2 of the present invention. FIG. 6 is a vibration attenuator in a color cathode ray tube according to Embodiment 3 of the present invention. FIG. 7 is a cross-sectional view showing a shadow mask. FIG. 7 is a cross-sectional view showing another configuration example of a vibration attenuator and a shadow mask in a color cathode ray tube according to Embodiment 3 of the invention. FIG. 9 is a cross-sectional view showing still another configuration example of a vibration attenuator and a shadow mask in a color cathode ray tube. FIG. 9 is a cross-sectional view showing a vibration attenuator and a shadow mask in a color cathode ray tube according to Embodiment 4 of the invention 10A is a schematic perspective view of a shadow mask assembly in a color cathode ray tube according to Embodiment 5 of the present invention. FIG. 10B is a partial side view of the shadow mask assembly viewed from the direction of arrow 10B in FIG. 10A. FIG. 11 is a cross-sectional view showing a vibration attenuator and a shadow mask in a conventional color cathode ray tube.
DESCRIPTION OF SYMBOLS 1 Color cathode ray tube 5 Shadow mask 6 Mask frame 10 Vibration attenuation body 11 Attachment hole 13a Overhanging part 13b Through-

hole parts

14 and 16 Protrusion 15 Protrusion part 17 Washer (perforated member)
19 Flat plate (perforated member)
20 Pipe (perforated member)
51 Member (separate member)

Claims

A shadow mask held in a state where tension is applied;
Two attachment holes provided in the shadow mask or another member attached to the shadow mask and vibrated by vibration of the shadow mask;
A color cathode ray tube comprising: a vibration attenuator that penetrates through the two attachment holes and is attached to the shadow mask or the separate member in a movable state and attenuates the vibration of the shadow mask;
The vibration damping body has two penetrating parts that loosely pass through the two attachment holes, and a connecting part that connects the two penetrating parts,
The two penetrating portions are bent with respect to the spanning portion at both ends of the spanning portion,
A color cathode ray tube characterized in that a projection or a projecting portion projecting toward the shadow mask or the separate member is provided in the span portion.

A shadow mask held in a state where tension is applied;
Two attachment holes provided in the shadow mask or another member attached to the shadow mask and vibrated by vibration of the shadow mask;
A color cathode ray tube comprising: a vibration attenuator that penetrates through the two attachment holes and is attached to the shadow mask or the separate member in a movable state and attenuates the vibration of the shadow mask;
The vibration attenuating body has at least two penetrating parts that pass through the two attachment holes, and a connecting part that connects the two penetrating parts,
A color cathode ray tube characterized in that a projection or a projecting portion projecting toward the vibration attenuating body is provided in a region between the two attachment holes of the shadow mask or the separate member.

A shadow mask held in a state where tension is applied;
Two attachment holes provided in the shadow mask or another member attached to the shadow mask and vibrated by vibration of the shadow mask;
A color cathode ray tube comprising: a vibration attenuator that penetrates through the two attachment holes and is attached to the shadow mask or the separate member in a movable state and attenuates the vibration of the shadow mask;
The vibration attenuating body has at least two penetrating parts that pass through the two attachment holes, and a connecting part that connects the two penetrating parts,
The color cathode ray tube further includes a perforated member that is penetrated by the vibration attenuating body and attached to the vibration attenuating body in a freely movable state.

A shadow mask held in a state where tension is applied;
Two mounting holes provided in the shadow mask;
A color cathode ray tube comprising: a vibration attenuator that penetrates the two attachment holes and is attached to the shadow mask in a freely movable state to attenuate vibrations of the shadow mask;
The vibration attenuating body has at least two penetrating parts that pass through the two attachment holes, and a connecting part that connects the two penetrating parts,
The vibration damping body, have a asymmetrical shape with respect to the center position of the two through portions,
The color cathode ray tube according to claim 1, wherein the asymmetric shape restricts an inclination angle of the vibration attenuator with respect to the surface of the shadow mask, so that a state in which the vibration attenuator can move with respect to the shadow mask is maintained .

A shadow mask held in a state where tension is applied in the vertical direction;
Two attachment holes provided in another member that is attached to a horizontal end of the shadow mask or a horizontal end of the shadow mask and vibrates by vibration of the shadow mask;
A color cathode ray tube comprising: a vibration attenuator that penetrates through the two attachment holes and is attached to the shadow mask or the separate member in a movable state and attenuates the vibration of the shadow mask;
The vibration attenuating body has at least two penetrating parts that pass through the two attachment holes, and a connecting part that connects the two penetrating parts,
The vibration damping body, have a asymmetrical shape with respect to the center position of the two through portions,
The asymmetric shape regulates an inclination angle of the vibration attenuator with respect to the surface of the shadow mask or the separate member, so that the state in which the vibration attenuator can move with respect to the shadow mask or the separate member is maintained. Characteristic color cathode ray tube.

A shadow mask held in a state where tension is applied;
Two attachment holes provided in the shadow mask or another member attached to the shadow mask and vibrated by vibration of the shadow mask;
A color cathode ray tube comprising: a vibration attenuator that penetrates through the two attachment holes and is attached to the shadow mask or the separate member in a movable state and attenuates the vibration of the shadow mask;
The vibration attenuating body has at least two penetrating parts that pass through the two attachment holes, and a connecting part that connects the two penetrating parts,
The color cathode ray tube according to claim 1, wherein the vibration attenuator has an asymmetric shape with respect to a central position of the two through portions, and one end of the span portion extends beyond the through portion.

The color cathode ray tube according to claim 1, wherein the two attachment holes are provided in the shadow mask.